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改性纤维素类固沙材料对草本植物出苗率及幼苗生长的影响
袁进科, 陈杰
成都理工大学 地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059
摘要:
[目的] 研究新型固沙材料与5种典型草本植物的相容性影响,为九寨沟景区震后生态恢复重建提供理论依据。[方法] 基于改性纤维素类新型固沙材料和典型草本植物,利用基质吸力分析、植被模拟分析和相关统计等方法,探讨不同配比方式的固沙材料与草本植物的相容性机理。[结果] 固沙材料基质吸力最终稳定在80 kPa左右,可以给植物根系生长提供稳定的供水环境;灯笼草和唐松草在两种配比的固沙材料中均有出苗,说明这两种植物与固沙材料相容性良好,从出苗率分布看,唐松草 > 灯笼草 > 金线草、茜草、夏枯草,其中唐松草出苗率达到30%;1:3液固质量比的固沙材料含水率更高,植物株苗存活时间更长;种子出苗区域均位于固沙材料孔隙较大的位置。[结论] 新型固沙材料基质吸力最终在80 kPa以内,1:2配比固沙材料的唐松草出苗率为30%,灯笼草平均根径达到2 mm,同时具有一定孔隙的固沙材料更适宜植物幼苗生长。
关键词:  沙土  改性纤维素  固沙剂  草本植物  出苗率
DOI:10.13961/j.cnki.stbctb.2020.03.039
分类号:S157;Q945.3
基金项目:国家自然科学基金项目“纤维素类固化剂加固砂土边坡作用机理及抗冲蚀效应研究”(41702318);四川省国土资源厅项目“新型高聚物生态护坡材料与植被加固工艺研究”(KJ-2018-25)
Effects of Modified Cellulose Polymer Sand-Fixing Material on Emergence Rate and Seedling Growth of Herbaceous Plants
Yuan Jinke, Chen Jie
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract:
[Objective] The compatibility impacts of new sand-fixing materials on five typical herbaceous plants were studied to provide a theoretical basis for the ecological restoration and reconstruction of the Jiuzhaigou scenic area after an earthquake.[Methods] Based on the new sand-fixing materials of modified cellulose and typical herbaceous plants, matric suction analysis, vegetation simulation analysis, and relevant statistics were used to study the compatibility mechanism between sand-fixing materials of different proportions and herbaceous plants.[Results] The matrix suction of the sand-fixing material was stabilized at approximately 80 kPa, which could provide a stable water supply environment for plant root growth. Physalis alkekengi and Thalictrum aquilegifolium had germinated in two kinds of sand-fixing material, indicating that these two plants had good compatibility with the sand-fixing materials. From the distribution of the germination rate, T. aquilegifolium > P. alkekengi > Rubia membranacea, Rubia cordifolia, Prunella vulgaris, the germination rate of T. aquilegifolium reached 30%. A 1:3 liquid-solid mass ratio of sand-fixing material had a higher water content, and plant seedlings survived longer. The germination area of the seeds was at a position where the pores of the sand-fixing material were large.[Conclusion] The final matric suction of new sand-fixing material was within 80 kPa, the emergence rate of T. aquilegifolium with a 1:2 ratio of sand-fixing material was 30%, the average root diameter of P. alkekengi was 2 mm, and the sand-fixing materials with a certain porosity were more suitable for the growth of plant seedlings.
Key words:  sandy soil  modified cellulose polymers  sand-fixing material  herbaceous plant  emergence rate